linux-kernel - [tip:perf/core] perf report: Add an indication of what time slices are used

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Date:   Wed, 17 Jan 2018 08:36:38 -0800
From:   tip-bot for Jin Yao <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     yao.jin@...ux.intel.com, tglx@...utronix.de, ak@...ux.intel.com,
        jolsa@...hat.com, peterz@...radead.org, acme@...hat.com,
        hpa@...or.com, alexander.shishkin@...ux.intel.com,
        mingo@...nel.org, linux-kernel@...r.kernel.org, kan.liang@...el.com
Subject: [tip:perf/core] perf report: Add an indication of what time slices
 are used

Commit-ID:  7425664bbd3174814500c7ab8740cbb9bb25396c
Gitweb:     https://git.kernel.org/tip/7425664bbd3174814500c7ab8740cbb9bb25396c
Author:     Jin Yao <yao.jin@...ux.intel.com>
AuthorDate: Wed, 10 Jan 2018 23:00:30 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 17 Jan 2018 10:23:36 -0300

perf report: Add an indication of what time slices are used

Add a time slices indication to the perf report header.

For example,

  # perf report --stdio --time 10%

  # Total Lost Samples: 0
  #
  # Samples: 9K of event 'cycles:ppp' (time slices: 10%)
  # Event count (approx.): 8951288803

Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
Suggested--by: Arnaldo Carvalho de Melo <acme@...hat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Reviewed-by: Jiri Olsa <jolsa@...hat.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1515596433-24653-6-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-report.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 7d4f0a5..4aaaa37 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -404,6 +404,9 @@ static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report
 	if (evname != NULL)
 		ret += fprintf(fp, " of event '%s'", evname);
 
+	if (rep->time_str)
+		ret += fprintf(fp, " (time slices: %s)", rep->time_str);
+
 	if (symbol_conf.show_ref_callgraph &&
 	    strstr(evname, "call-graph=no")) {
 		ret += fprintf(fp, ", show reference callgraph");